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Publisher DOI: 10.1177/1475921720982885
Title: Nonlinear modulation with low-power sensor networks using undersampling
Language: English
Authors: Oppermann, Peter 
Dorendorf, Lennart 
Rutner, Marcus 
Renner, Bernd-Christian 
Keywords: Vibro-acoustics; nonlinear modulation; structural health monitoring; wireless sensor network; low power
Issue Date: 14-Jan-2021
Publisher: SAGE Publications
Source: Structural Health Monitoring 20 (6): 3252 - 3264 (2021)
Abstract (english): 
Nonlinear modulation is a promising technique for ultrasonic non-destructive damage identification. A wireless sensor network is ideally suited to monitor large structures using nonlinear modulation in a cost-efficient manner. However, existing approaches rely on high sampling rates and resource-demanding computations that are not feasible on low-cost and low-power sensor network devices. We present a new damage indicator that uses the short-time Fourier transform to derive amplitude and phase modulation with less computational effort and memory usage. Evaluation of the proposed method using real experiment data exhibits performance and reliability similar to the conventionally used modulation index. Undersampling is demonstrated, which reduces the memory demand in a test scenario by more than 100 times, and the required energy for sampling and processing more than four times. The loss of accuracy introduced by undersampling is shown to be negligible.
DOI: 10.15480/882.4260
ISSN: 1741-3168
Journal: Structural health monitoring 
Institute: Telematik E-17 
Metall- und Verbundbau B-8 
smartPORT E-EXK2 
Document Type: Article
Project: I³-Lab - Strukturelle Integrität durch Vibroakustische Modulation zur Verlängerung der Lebensdauer ziviler Infrastruktur 
Funded by: Behörde für Wissenschaft, Forschung und Gleichstellung 
License: In Copyright In Copyright
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